I don't have a huge directory but my site fits here... http://supplierlocator.com - The company profiles indicate dropshipping yes/no (that is if the company filled out that field!).

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Leisa
Wholly Wholesale - Wholesale Auctions - http://whollywholesale.com
eStoreFinder.com - eCommerce Store Directory - http://eStoreFinder.com
WholesaleLowdown.com - A Guide for Retailers - http://wholesalelowdown.com